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A000685 as a simple table

na(n)
11
25
341
4545
511681
6402305
722207361
81961396225
9276825510401
1062368881977345
1122413909724518401
1212840603873823473665
1311720394922432296755201
1417037597932370037286600705

[1,5,41,545,11681,402305,22207361,1961396225,
 276825510401,62368881977345,22413909724518401,
 12840603873823473665,11720394922432296755201,
 17037597932370037286600705]